Can't get lathe to Feed

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16 Aug 2021 12:04 #217877 by Clive S
Replied by Clive S on topic Can't get lathe to Feed

Andy,

Ref: encoder.N.missing-teeth

My encoder disc has 100 slots. Should I blank out two slots and use this method?
Do we leave the 'scale' still set at 100 ?


I have added my config and pics of the Boxford 125

forum.linuxcnc.org/38-general-linuxcnc-q...ved?start=110#217847

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16 Aug 2021 23:48 #217932 by andypugh
Replied by andypugh on topic Can't get lathe to Feed

My encoder disc has 100 slots. Should I blank out two slots and use this method?
Do we leave the 'scale' still set at 100 ?

Yes, the scale still stays at however many teeth there would be. 
You can blank out one or more teeth. 

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17 Aug 2021 05:19 #217953 by rider-83
Replied by rider-83 on topic Can't get lathe to Feed
My thoughts were to blank out two teeth with epoxy, but I'm unsure how to set up this 'missing-teeth'. Is this only available to ver2.9 ?

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17 Aug 2021 07:40 #217962 by andypugh
Replied by andypugh on topic Can't get lathe to Feed

My thoughts were to blank out two teeth with epoxy, but I'm unsure how to set up this 'missing-teeth'. Is this only available to ver2.9 ?

I think that I would start with tape if it is an optical sensor. If it is inductive then neither tape nor epoxy will work. 

Missing-tooth index is, indeed, only available with 2.9. (though it would work with 2.8 if you compiled it for 2.8) 

Setup is as simple as connecting just channel-A and using a "setp" in the HAL file to set the number of missing teeth. 
 

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17 Aug 2021 08:10 #217964 by rider-83
Replied by rider-83 on topic Can't get lathe to Feed
Tape is a good idea. Ta.

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18 Aug 2021 17:55 #218083 by rider-83
Replied by rider-83 on topic Can't get lathe to Feed
Does this look correct?

Swap:
net pulse-index-combined parport.1.pin-10-in encoder.0.phase-A encoder.0.phase-Z

for
net pulse-index-combined parport.1.pin-10-in encoder.0.phase-A
setp encoder.0.missing-teeth 2

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18 Aug 2021 22:17 #218095 by andypugh
Replied by andypugh on topic Can't get lathe to Feed
Yes, looks right.

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21 Aug 2021 13:17 #218325 by rider-83
Replied by rider-83 on topic Can't get lathe to Feed
parameter or pin'encoder.0.missing-teeth 2' not found

Hmmm, I think I've done something wrong

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22 Aug 2021 00:42 #218368 by andypugh
Replied by andypugh on topic Can't get lathe to Feed
Are you using LinuxCNC 2.9?

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22 Aug 2021 07:09 #218382 by rider-83
Replied by rider-83 on topic Can't get lathe to Feed
Yes,
I installed some months back for the use of the G71

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